Place it just before the reveal in an edit, then follow it with Vine Boom for the punch and Dun Dun Dun when the secret lands, keeping the smirk as the setup for the bigger reaction.
About this sound
This 1.2-second clip is the short sound from the smirking emote in Animal Crossing, a quick, coy villager noise with a sly, knowing edge. It feels playful and a little cheeky, like catching someone in a joke they are not quite admitting. It comes from the game's emote reactions, where villagers use it to show a smug, self-satisfied mood.